Yes, you can removed the wallpaper from the aluminum sheets. It wont take you that long though if you don't count the prep time it takes you to remove anything you need, like the couch, beds, trim, etc.
I completely gutted my 24ft 82' last summer and also took on the project of removing the paper (more like vinyl stuff) from the interior. I tried several different methods before finding what would actually work quickly without damaging the skin. I used Jasco Paint thinner from Lowes:
http://www.lowes.com/pd_6058-1168-0203-30-02_0__?productId=3370378&Ntt=paint+remover&pl=1¤tU RL=%2Fpl__0__s%3FNtt%3Dpaint%2Bremover&facetInfo=
The real trick is to let the goop do the work. Get a couple wide brushes (that will be ruined), a breathing mask, gloves, a couple fans to ventilate the inside, and start slopping that stuff on. It was easy for me because I didnt have to worry about it (goop) coming in contact with anything other than the wood floor and wallpaper. If it touches ANYTHING made of plastic or painted or the like there is a good chance it will ruin it. Keep that in mind. Let it stay on the wall paper until you can EASILY pull big sections off with your hands (gloves on). You wont even have to use a scrapper. And never try pull past its absorb point. If you do, it can warp the aluminum.
PS: Nice looking interior. I really like the black furniture!